Evidence supporting the use of: Isatis
For the health condition: Congestion

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Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Isatis, particularly Isatis tinctoria (woad) and Isatis indigotica, is widely used in Traditional Chinese Medicine (TCM), most commonly as the dried root (ban lan gen) or leaf (da qing ye). In TCM, Isatis is traditionally used to "clear heat," "remove toxins," and treat symptoms associated with respiratory tract infections, such as sore throat, fever, and congestion. Its use for congestion is primarily based on empirical and historical practice rather than modern scientific validation.

Phytochemical studies have identified compounds in Isatis with potential antiviral and anti-inflammatory properties, such as indirubin and tryptanthrin. However, clinical studies directly evaluating Isatis for congestion, especially nasal congestion as understood in Western medicine, are limited and mostly of low methodological quality. Most evidence comes from traditional usage patterns and preclinical studies showing broad antimicrobial or immunomodulatory effects, which might theoretically contribute to symptom relief in upper respiratory infections.

In summary, Isatis is used for congestion based on traditional practices in Chinese herbal medicine, with some supporting laboratory data but little robust clinical evidence for this specific indication. The evidence supporting its use for congestion is therefore rated low (2/5), with justification primarily rooted in tradition rather than strong scientific validation.

More about Isatis
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